@Kompetenzz They are both zirkons. Please do research before saying somehing dumb. https://www.google.nl/search?q=zirkonia&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiCk-6nvYbTAhXBvhQKHbfyDM8Q_AUICCgB&biw=1536&bih=759#tbm=isch&q=zirkon+lichtbalk&*&imgrc=dCc1GGkIRuJv1M: